ASEA Brown Boveri RGB12 12kV switchgear

Transcription

1 Document No: SDI 206 Amendment No: 6 Substation Design Instruction ASEA Brown Boveri RGB12 12kV switchgear IMPORTANT DISCLAIMER As the information contained in this publication is subject to change from time to time, Endeavour Energy gives no warranty that the information is correct or complete or is a definitive statement of procedures. Endeavour Energy reserves the right to vary the content of this publication as and when required. You should make independent inquiries to satisfy yourself as to correctness and currency of the content. Endeavour Energy expressly disclaims all and any liability to any persons whatsoever in respect of anything done or not done by any such person in reliance, whether in whole or in part, on this document. Copyright Endeavour Energy 2016

2 ASSET STANDARDS & DESIGN Substation Design Instruction Document No Amendment No Approved By Approval Date Review Date : : : : : SDI MASD 11/01/16 11/01/19 SDI 206 ASEA BROWN BOVERI RGB12 12KV SWITCHGEAR CONTENTS 1.0 PURPOSE SCOPE REFERENCES DEFINITIONS AND ABBREVIATIONS ACTIONS General Introduction Product approval and stock codes Dimensions, weight and description Technical specification Single line diagrams - Operating Diagram Symbol Gas indicator Accessories Installation General Switch (manual spring charge) Fuse-switch combination Switch (motor spring charged) Fixed housings Switchboard assembly Cabling Operation Interlocks Operation Principles of operation Drawings AUTHORITIES AND RESPONSIBILITIES SDI 206 Copyright Endeavour Energy 2016 Page 2 of 14

3 7.0 DOCUMENT CONTROL SDI 206 Copyright Endeavour Energy 2016 Page 3 of 14

4 1.0 PURPOSE This standard provides technical and reference information to assist with the safe design, installation, commissioning, operation and decommissioning of ASEA Brown Boveri RGB12 12kV switchgear. 2.0 SCOPE This instruction provides information and reference documentation to assist in the safe design, installation, commissioning, operation and decommissioning of ASEA Brown Boveri RGB12 12kV switchgear. This instruction deals only with the standard units that were previously approved for use by Endeavour Energy in the distribution network as detailed in The scope of this document provides reference to the various lifecycle stages of the switchgear and therefore shall be read in conjunction with the references of section 3.0 and: Mounting and construction requirements: refer Mains Construction Instruction MCI 0006 Underground distribution: Construction standards manual; Earthing design, construction and testing: refer Earthing Design Instruction EDI 100 Distribution earthing design, construction and test; Specification of new equipment: refer Equipment Technical Specification ETS 0068 Distribution indoor and padmount substation 12-24kV switchgear; General details and minimum design requirements: refer Substation Design Instruction SDI 101 Distribution substation general details and minimum requirements and Mains Design Instruction MDI 0028 Underground distribution network design; Testing and commissioning: refer Substation Design Instruction SDI 120 Testing and commissioning for distribution systems; Ongoing maintenance requirements: refer Substation Maintenance Instruction SMI 101 Minimum requirements for maintenance of distribution equipment; and Standard drawing requirements: Standard Asset Data SAD 0001 Project drawing standards. Note: This switchgear is no longer approved for use on Endeavour Energy s network. This instruction is for reference purposes only. This switchgear is currently being replaced under Endeavour Energy s Capital Refurbishment program due to its poor reliability. Extension of this switchgear to cater for new feeders is no longer allowed. If more HV feeders are required, the switchgear shall be replaced or a separate switchboard shall be installed. All dismantled switchgear that is in good condition is to be tested by Transmission Technologies and, if it passes the tests, is to be kept as spares for fault and emergency work. Units that do not pass the tests are to be disposed of according to Company Procedure GSU SDI 206 Copyright Endeavour Energy 2016 Page 4 of 14

5 3.0 REFERENCES Company Policy (Network) Commissioning Network Electrical Assets Company Policy Network Protection Company Policy (Network) Network Asset Design Company Policy (Network) Network Asset Construction Company Policy (Network) Network Operations Company Policy (Network) Network Asset Maintenance Company Procedure GSU Disposal of surplus goods and equipment Equipment Technical Specification ETS 0068 Distribution indoor and padmount substation 12-24kV switchgear Equipment Technical Specifications (ETS) ETS Distribution fuses Mains Construction Instruction MCI 0006 Underground distribution: Construction standards manual Mains Design Instruction MDI 0028 Underground distribution network design Substation Design Instruction SDI 101 Distribution substation general details and minimum requirements Substation Maintenance Instruction SMI 101 Minimum requirements for maintenance of distribution equipment Substation Maintenance Instruction SMI Sheet steel enclosed switch and switch fuse units Company Network Management Plan December Review Work Health and Safety Act 2011 (NSW) Work Health and Safety Regulation 2011 Australian Standards AS HV AC switchgear and control gear common requirements ENA National Electricity Network Safety Code (Doc ) AS High voltage fuses (for rated voltages exceeding 1000V) Current limiting (powder filled) type Branch Workplace Instruction WCB Brown Boveri Type RGB Switchgear Branch Workplace Instruction WRG Control of RGB12 switchgear Operating Instructions - Type tested metal-enclosed Compact Switchgear Type RGB 12/13.8 for 12 and 13.8kV 4.0 DEFINITIONS AND ABBREVIATIONS A full list of definitions is contained in SDI ACTIONS 5.1 General Introduction ASEA Brown Boveri RGB12 equipment is cast resin, air and solid insulated, sheet-steel, enclosed indoor HV switchgear. The switches and fuse-switch combinations are stored spring energy, threephase, gang-operated, and mounted in withdrawable trucks. ASEA Brown Boveri RGB12 switchboards are extendable in the field. It should be noted, however, that extension to the lefthand side of existing switchboards: Is not possible adjacent to a busbar cabling housing. Is possible on all other housings by replacing the left hand end busbar with a left-right extension busbar. SDI 206 Copyright Endeavour Energy 2016 Page 5 of 14

6 5.1.2 Product approval and stock codes Endeavour Energy no longer approve or purchase these units Dimensions, weight and description Front view 114 Ø * * Switch (manual spring charge) Switch (motor spring charge) Add 200mm to dimensions shown * Figure 1 - Dimensions 114 Ø * Fuse switch combination SDI 206 Copyright Endeavour Energy 2016 Page 6 of 14

7 1 Fixed housing 2 Switch truck 3 Fuse switch combination truck 4 Busbar 5 Cable terminal board 6 Cable terminals 7 Cable earthing stud 8 Direct earthing terminal 9 Earthing access shutter 10 Isolated position 11 Fuse links and tripping device 12 Pressure relief cover 13 Position indicator 14 Manual trip knob 15 Spring charge operating handle 16 Interlock handle 17 Truck withdrawal handle 18 Short circuit indicator (if fitted) Cable terminal box (not Endeavour Energy standard) Cable sealing end fixing holes (not Endeavour Energy standard) 22 Cable support bracket 23 Busbar contacts 24 Hinged cover interlocking knob Upper (cable) and lower (busbar) tulip contacts Cross link (remove to fully withdraw truck) Figure 2 - Switch unit Figure 3 - Fuse unit 27 Sliding earth contact 35 Spring operated tripping device 28 Main fixed contact tube 36 Automatic tripping device 29 Movable main tulip contact 37 Fuse handle and clamp contact 30 Movable contact rod 38 Tulip contact (fuse) 31 Fixed sliding contact 39 O rings (lower insulation block and pistons) 32 Insulating rod 40 Centre pin (main tulip contact) 33 Helical gas cooler 41 Perforated washer 34 Operating mechanism 42 Steatite coolers SDI 206 Copyright Endeavour Energy 2016 Page 7 of 14

8 5.1.4 Technical specification Insulation level (all equipment) Rated voltage 12/13.8kV 50Hz one (1) minute power Phase to earth 45kV rms frequency withstand Across isolating distance 60kV rms 1.2/50 µs lightning impulse Phase to earth 95 kvp withstand (BIL) Across isolating distance 110 kvp DC 15 min. withstand 25 Kv Partial 8kV 5pC 1 Partial 13kV 10pC 1 Switch and busbar Rated normal current 400 A 2 Rated current of busbars 500 A Rated short time withstand current for one (1) second 25 ka 2 Rated peak withstand current 70 ka 2 Rated short circuit making current - cable feeder 50 ka Rated breaking capacity - Mainly active load at 0.7pf 800 A - Closed loop at 0.3pf 400 A 3 - Cable charging 25 A - Transformer off load 16 A - Max load breaking 0.3pf 240 A Motor spring charge detail - Voltage 110V DC - Motor current rating 2.1 A - Spring charge operating time 22 seconds - Operating time to open 70 m/s Fuse carrier Rated normal current 100 A Rated peak withstand current 70 ka Acceptable power 75 Watts 4 Will accommodate fuse links to the following dimensions : - Overall length mm to - 3mm - Overall diameter 88mm max. - Contact ferrule diameter 45 ±1mm - Contact ferrule length 34 ±1mm Will accommodate current limiting fuse links to:- AS fuse link type I Test limits on new equipment prior to delivery from manufacturer. Higher figures may occur in service. These values are for switches and relate only to fuse switch combinations when they are fitted with solid links. When fitted with fuse links, the fuse characteristics would apply. A circuit in which both sides of the switch remain live after breaking, and in which the voltage appearing across the terminals is substantially less than the system voltage. The power dissipation of the fuse links must not exceed the power acceptability of the fuseholder. The 75 Watts is a calculated (cold) power and is the maximum dissipation figure as it relates to the resistance of the fuse link at 20 deg. C. SDI 206 Copyright Endeavour Energy 2016 Page 8 of 14

9 5.1.5 Single line diagrams - Operating Diagram Symbol The operating diagram symbols to be shown on projects drawings for the switchgear shall be a combination, in accordance and aligned with the switchgear configuration, of the following basic types as shown below. More detail on the actual mechanism is provided in installation and operating instructions. Project drawing standards shall be in accordance with SAD0001. Switch unit Switch/fuse unit Bus-section unit XXXX XXXX XXXX XXXX OPERATING NUMBER FUSE SWITCH Figure 4 - Single line diagram Gas indicator There is no gas in this switchgear it is cast resin, air and solid insulated in a sheet-steel enclosure Accessories Earthing device Earthing of the cable is done by means of a special earthing device (see Figure 5 - Earthing leads) which is connected to the earthing terminal on the top of the cable termination block. 5.2 Installation General Figure 5 - Earthing leads RGB12 switchgear is designed for installation in an indoor substation/switching station. Anti-condensation heaters should be installed. Problems have occurred in the past from condensation and tracking where heaters were not fitted. A thermostat shall also be fitted to the switchgear. Three (3) basic withdrawable trucks are purchased: a manual spring charge switch, a manual fuseswitch combination, and a motor spring charge switch. SDI 206 Copyright Endeavour Energy 2016 Page 9 of 14

10 5.2.2 Switch (manual spring charge) The switch consists of three (3) single air break poles, which are gang operated by closing and opening springs. The poles are mounted in line, one behind the other, and are fully epoxy insulated Fuse-switch combination In addition to the three (3) pole switch described in clause 5.2.2, the units are fitted with epoxy insulated fuse carriers. Fuse carriers are housed in a metal enclosure fitted to the front of the truck; access to the fuses is gained by a hinged metal cover, which is fitted with a Perspex window. The hinged cover is interlocked so it cannot be opened until the switch is withdrawn into the isolated position. The carrier will accommodate fuses as specified in clause 5.1.4, which must be complete with striker pins, as the fuse-switch combination is designed to trip all three (3) poles should one or more fuse links rupture Switch (motor spring charged) The switch is as described in clause 5.2.2, but with the addition of a motor and gearbox to automatically charge the operating springs and solenoids to allow remote closing and opening. Refer to for details of voltages and times. When the truck is plugged into the service position, the circuit is arranged such that the motor will immediately charge the springs while the 110V DC control voltage is available (a warning label should state this on the front of the truck). Once charged, the springs have sufficient energy to close and open the switch, but reclosing cannot occur until after 22 seconds, which is the time required for the motor to re-charge the springs Fixed housings There are two basic housings: Switch or fuse-switch combination (fitted with cable terminal board). Bus section or busbar cabling Switchboard assembly The switchgear is to be assembled on a support plinth (refer Drawing no for trench access, or Drawing no for floor penetration access) Cabling Feeder Max cross-section each phase Refer Drawing no mm Termination hardware (cable lugs) SDI 206 Copyright Endeavour Energy 2016 Page 10 of 14

11 To ensure that cable lugs are suitable for terminating on RGB12 cable terminal board, they are to comply with the following limiting dimensions: 50mm maximum 13mm minimum 16mm maximum 10mm maximum 30mm maximum 10mm Slot recommended to give tolerance and not exert pressure on terminal stud. 20mm minimum Length not critical If allen key is supplied to position lug on cable prior to welding or sweating, it must be located in this position Material to be compatible with cable and also copper or brass spacer. Note: Torque setting to be used when connecting cables to the 12mm cable termination studs is a minimum of 52Nm (38ft/lb) and a maximum of 57Nm (42ft/lb) Transformer Flexible cable is used to couple the switchgear to the transformer. The cable provides fast and efficient connection/disconnection without specialised cable jointing techniques. The technical detail for this cable is: Type of insulation: Type of screen: Voltage rating: Conductor: Overall diameter of cable: Length: Minimum bending radius: XLPE with PVC cable sheath Semi-conductor tape with overlapped copper wire 12kV/28kVrms/95kVpeak 16mm 2 copper 25mm 4000mm 200mm SDI 206 Copyright Endeavour Energy 2016 Page 11 of 14

12 5.3 Operation Interlocks General The following interlocks should be provided to prevent incorrect operation and injury to personnel: Truck can only be withdrawn from, or enter into, housing with switch in the OPEN position. Truck must be withdrawn to the ISOLATED position before the fuse housing cover can be opened Earthing shutter Truck must be withdrawn to the ISOLATED position before the earthing access shutter can be lowered. Earthing access shutter cannot be removed with truck in isolated position (refer Drawing no ). Earthing access shutter to be suitable for a padlock (refer Drawing no s , ) Handle to be suitable for a padlock (refer Drawing no s , ) Springs cannot be charged with a tripping impulse on. Trucks will enter other housings of same type truck (refer Drawing no ). Truck will not enter other housings of alternate type truck (refer Drawing no ) Operation Switch unit - Maunal spring charge Closing Switches are closed by pulling the spring charge operating handle four (4) times. When the lever is pushed back after the last pull, the switch closes. Opening Pushing the manual trip knob releases a spring-operated tripping device Switch unit - Motorised spring charge Electrical operation - can be local or remote. Mechanical operation (in an emergency). In an emergency, the springs can be manually charged with an operating handle. However, the following should be noted: The supply to motor should be isolated. The linkage pin must be removed and linkage arm swung clear of charging mechanism to avoid damaging the gearbox (this can be done without removing the cover). Manually charging can be carried out as in clause 5.2.2, but closing is not automatic. The manual close button must be operated. When re-connecting gearbox linkages, the cover may have to be removed. Supply to the motor should not be re-installed until linkages are connected Principles of operation The arc-extinguishing mechanism is fitted with a contact system consisting of a main fixed contact tube (28), and a movable main tulip contact (29), fitted with a gas evolving nozzle. Both main contacts are fitted with copper-wolfram tips. SDI 206 Copyright Endeavour Energy 2016 Page 12 of 14

13 The main tulip contact with nozzle is fixed to the end of the movable contact rod (30), which is guided by the fixed sliding contact (31), and is attached to the operating mechanism through the insulating rod (32). The length of travel is 200mm. During the opening movement of the switch, the piston part of the nozzle compresses the air in the lower part of the switch chamber. The air blast escapes through the movable main contact, the gas evolving nozzle, and the fixed main contact tube, to the top of the switch. The ionised exhaust from the arc quenching is cooled by means of a cooling system (33), in the switch exhaust outlets, before it is let out in open-air via steatite cooler (42), at the top of the cubicle (12). The operating mechanism (34) has separate operating springs for opening and closing of switch. Both operating springs are charged at the same time: a) by the operating lever (15), which is pulled four times (through an angle of approximately 45 ). When the lever is pushed back after the last pull, the switch closes; or, b) automatically, in the case of motoroperated version. The switch closes when the electrical or manual close button is operated. The switch is opened by pushing the manual trip knob or electrical trip button (in the case of motor-operated version), which releases a spring-operated tripping device. The operating mechanism is interlocked from being charged while a tripping command exists, and when the interlocking device of the truck is disengaged. Both types of switches (with and without fuses) have identical arc-extinguishing chambers and operating mechanisms. SDI 206 Copyright Endeavour Energy 2016 Page 13 of 14

14 5.4 Drawings The following drawings form part of this instruction: Drawing Amend. Title D 6.35/11kV paper insulated multi-core metallic sheathed cable C RGB12 truck interlock and stop bracket fabrication detail A RGB12 cable earthing padlock detail A RGB12 padlock tongue A RGB12 extra drill removal stop earthing cover A RGB12 assembly detail for padlocking A RGB12 padlock tag detail F RGB12 plinth trench type fabrication/installation detail D RGB12 plinth recessed floor type fabrication and installation detail 6.0 AUTHORITIES AND RESPONSIBILITIES General Manager Asset Management has the authority and responsibility for: approving this instruction; and approving variations to the requirements of this instruction. Manager Asset Standards & Design has the authority and responsibility for: endorsing this instruction; and recommending changes and revisions to this instruction. Manager Network Connections has the authority and responsibility for checking that all designs carried out by Level 3 Accredited Service Providers (ASP) conform to the requirements of this instruction. Network Substations Manager has the authority and responsibility for revising and updating this instruction in accordance with Endeavour Energy s Policies and Procedures. Regional managers have the authority and responsibility for checking that all designs carried out by regional employees conform to the requirements of this instruction. Level 3 Accredited Service Providers have the authority and responsibility checking that the latest issue of any instruction or drawing relevant to or listed in this manual is available and used during the design of any project and application of this standard. 7.0 DOCUMENT CONTROL Documentation Content Coordinator : Network Substations Manager Documentation Distribution Coordinator : Branch Process Coordinator SDI 206 Copyright Endeavour Energy 2016 Page 14 of 14